Datagrid cell style with converterParameter

Question

How to use converterParameter in a style setter on a datagrid cell? I need to know the element name or property name in my converter.

xaml:

<Window.Resources>
    <view:IsEnabledCellConverter x:Key="IsEnabledCellConverter"/>
    <Style x:Key="CellStyle" TargetType="{x:Type DataGridCell}">
        <Setter Property="IsEnabled" 
                Value="{Binding 
                        Path=Item,
                        Converter={StaticResource ResourceKey=IsEnabledCellConverter}, 
                        ConverterParameter={?????}}"
                        RelativeSource={RelativeSource AncestorType={x:Type DataGridRow}} />
    </Style>
.../...

<Datagrid>
     <DataGrid.Columns>
         <DataGridTextColumn x:Name="Design" 
                             CellStyle="{StaticResource CellStyle}" 
                             Value="{Binding Path=Design}"/>
         <DataGridTextColumn x:Name="FooBar" 
                             CellStyle="{StaticResource CellStyle}" 
                             Value="{Binding Path=Foobar}"/>
     </DataGrid.Columns>
</Datagrid>

Converter class:

class IsEnabledCellConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        string p = (string)parameter;
        MyItem item = (MyItem)value;

        switch (p)
        {
            case "Design":
                return string.IsNullOrEmpty(item.Reference);
                break;
            case "FooBar":
                return item.Something != true;
                break;
            default:
                return true;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

EDIT: I added some detail for understanding the needs. So all my columns IsEnabled props are binding this global Converter for two reasons:

it's easier to maintain
some column need to be enabled depending of the value of other item values.

In your question, which element name or property name are you looking for. — AnjumSKhan
I would like to retrieve the x:name of DatagridTextColumn or the Binding Path property eg "Design" — ebelair
Any good reason for doing so. If yes, you might have to use AttachedProperty. — AnjumSKhan

AnjumSKhan AnjumSKhan · Accepted Answer · 2016-09-21T07:02:31

You should use DisplayIndex or Header, and set ConverterParameter accordingly.

<Style x:Key="CellStyle" TargetType="{x:Type DataGridCell}">
    <Style.Triggers>
        <DataTrigger Binding="{Binding Column.DisplayIndex, RelativeSource={RelativeSource Self}}" Value="0">
            <Setter Property="IsEnabled" 
                    Value="{Binding 
                            Path=Item,
                            Converter={StaticResource ResourceKey=IsEnabledCellConverter}, 
                            ConverterParameter=0,
                            RelativeSource={RelativeSource AncestorType={x:Type DataGridRow}}}" />
        </DataTrigger>
        <DataTrigger Binding="{Binding Column.DisplayIndex, RelativeSource={RelativeSource Self}}" Value="1">
            <Setter Property="IsEnabled" 
                    Value="{Binding 
                            Path=Item,
                            Converter={StaticResource ResourceKey=IsEnabledCellConverter}, 
                            ConverterParameter=1,
                            RelativeSource={RelativeSource AncestorType={x:Type DataGridRow}}}" />
        </DataTrigger>
    </Style.Triggers>
</Style>

Please tell if this solves your problem.

Datagrid cell style with converterParameter

1 Answers